247 Eukrate

247 Eukrate
Discovery
Discovered by	Robert Luther
Discovery date	14 March 1885
Designations
MPC designation	(247) Eukrate
Pronunciation	/juːˈkreɪtiː/[1]
Alternative designations	A901 TB, 1947 TA,; 1960 TC
Minor planet category	Main belt
Orbital characteristics[2]
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	131.09 yr (47880 d)
Aphelion	3.4086 AU (509.92 Gm)
Perihelion	2.0778 AU (310.83 Gm)
Semi-major axis	2.7432 AU (410.38 Gm)
Eccentricity	0.24257
Orbital period	4.54 yr (1659.5 d)
Average orbital speed	18.0 km/s
Mean anomaly	75.9892°
Mean motion	0° 13m 0.948s / day
Inclination	24.991°
Longitude of ascending node	0.16410°
Argument of perihelion	54.969°
Physical characteristics
Dimensions	134.43±2.5 km
Rotation period	12.093 h (0.5039 d)
Geometric albedo	0.0595±0.002
Spectral type	CP
Absolute magnitude (H)	8.04

Eukrate (minor planet designation: 247 Eukrate) is a rather large main-belt asteroid. It is dark and probably a primitive carbonaceous body. The asteroid was discovered by Robert Luther on March 14, 1885, in Düsseldorf. It was named after Eucrate, a Nereid in Greek mythology.

In 2001, the asteroid was detected by radar from the Arecibo Observatory at a distance of 1.18 AU. The resulting data yielded an effective diameter of 134 ± 15 km.[3]

An Occult (Software) plot of 5 Occultation chords (and a miss) with DAMIT Inversion model at event time.

There have been 9 occultation observations of this asteroid since 2004.[4] The latest of 2018 May 12 was a 5 chord observation that allows, using Occult (Software), the scaling of the DAMIT model 1207, to yield a Mean volume-equivalent diameter of 137.5km and a Mean surface-equivalent diameter of 140.0 km.

References

A rare case of a long alpha in Greek, eukrātē, so the stress is on the 'a'. Cf. "eucratic". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
"247 Eukrate". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999 2003" (PDF), Icarus, 186 (1): 126–151, Bibcode:2007Icar..186..126M, doi:10.1016/j.icarus.2006.08.018, retrieved 14 April 2015.
"PDS Asteroid/Dust Subnode". sbn.psi.edu. Archived from the original on 25 April 2018. Retrieved 19 May 2018.

External links

The Asteroid Orbital Elements Database
Minor Planet Discovery Circumstances
Asteroid Lightcurve Data File
247 Eukrate at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
247 Eukrate at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[1] A rare case of a long alpha in Greek, eukrātē, so the stress is on the 'a'. Cf. "eucratic". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)

[jpldata-2] "247 Eukrate". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.

[icarus186_1_126-3] Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999 2003" (PDF), Icarus, 186 (1): 126–151, Bibcode:2007Icar..186..126M, doi:10.1016/j.icarus.2006.08.018, retrieved 14 April 2015.

[4] "PDS Asteroid/Dust Subnode". sbn.psi.edu. Archived from the original on 25 April 2018. Retrieved 19 May 2018.